private void Mouse_Load()
 {
     mh = new MouseHook();
     mh.SetHook();
     mh.MouseDownEvent += mh_MouseDownEvent;
     mh.MouseUpEvent   += mh_MouseUpEvent;
     mh.MouseMoveEvent += mh_MouseMoveEvent;
     hook = Hook.GlobalEvents();     //新钩子读取滚轮
     hook.MouseWheelExt += Hook_MouseWheelExt;
 }